It's still a pretty terrible assumption of you to make. I bought a 3DS back in August and Pokemon in October. That's the last time I was able to spend any amount of money on gaming anything, and right now I'm saving up for the Wii U and the game and I'll be lucky to have that money together by launch, let alone enough for another controller. Luckily I've a brother who is going to let me borrow it, but if it weren't for that I'd be planning on using the game pad as well.
The fact that you can and will be able to buy everything you need does not mean you ought to assume everybody can. In fact, it's fairly egocentric of you.
No no no, I do not believe that because I can afford something mean others should, I've lived in the ghetto my whole life so I know what I can't afford, and I'm really poor even with a job, I'm just stating that some expenses that people are concerned about don't necessarily add up or should be of minimal concern. Just as an example, if one could pay a premium monthly for internet fast enough to enable them to play a video game online, yet I become concerned about the expense of a game or a peripheral for said gaming it doesn't make much economic sense, especially when I could simply get internet good enough for me to check email and send assignments; I've made a conscious choice to do so, so the complaint about something else's expense is only a result of the mitigated finances that go to my internet, in the end I'm torn between two things that are basically unnecessary. I pay around 50 a month for high speed internet so that I can enjoy the services at the rate in which I am accustomed too , so paying a minor amount to further enjoy my services isn't really a huge concern considering that I have been doing so for so many years. Like you, I am also saving for the system, game and controller.
Gaming as a hobby--rather, getting the full experience out of a game is extremely expensive, but knowing that this is Nintendo I know there will be different outlets in which my experience can change. I feel that if you can successfully purchase a system, the game, while still being able to pay a monthly premium for online services to enable your gaming habits your finances are not in a position where you can't afford something as an additional peripheral in the near future, unless you are expecting a large fluctuation in your finances in your near future. I feel that saving the money for the controller and buying it second hand dealer such as Amazon is reasonable; hell I bought a 50 dollar Playstation 3 controller just by doing surveys for amazon points. It took me about 5 months just to get that but I did as I had no dispensable income.
Also it's funny that you mention you bought a 3DS in August, because I did the very same thing and bought it with Pokemon, but unfortunately I had to trade it in to get another game I wanted on sale. I didn't want to but that's how things are; everything costs something. Either way, I'm no rich man, but I've been gaming for a while and I know the hobby is getting more and more expensive so I tend not to find spending more money on it if I do desire to be a big issue considering all of everything else I pay for. Enjoying games is often a sacrifice of time and finances that could be directed elsewhere. That's atleast how I see it. However, I can see where I could have came off as wrong because I don't even know how he acquired his system; for all I know he could have broken into someone's house and gotten it lol.
I feel like it would be in his best interest to have a Pro Controller since the button layout is the same. I could also say it is more comfortable but that is subjective to tastes. I would imagine having to carry it around would require a back pack or something to play with assuming you are going to travel with it, then again it could be convenient is you just used the ones with the consoles used at tournaments (if he is into that thing). The only foreseeable issue is if you have 2 people who want to use the pad, as to my knowledge you can't have 2 Wii U pads synced to one system, unless it functions just as a controller like in DK Tropical Freeze. Time will tell either way.
Not related, but I just remembered that Nintendo 64 games used to be 70 dollars. Wtf man?