I doubt anyone on this site will tell you not to go to tournaments anymore.
More entrants = more money
more money = bigger pool for those that win
It all feeds into itself, most of the entrants want that win easy but a few actually do want a challenge. It's up to you to get better man.
My advice would be to play a ton of friendlies if you don't have the money to go to weeklies all the time or whatever. My local places have friendlies before each weekly or monthly, and we have 2-3 people that host smash fests at their house/apts every week. We usually do them just for bragging rights or goofy prizes, we always take them seriously though and help those that need help improve. Some might intentionally let you keep making mistakes so they can keep winning locals, but hopefully most will tell you what you're doing wrong and teach you. Personally I go out of my way to tell people about their bad habits and tell them how I'm taking advantage with a character, that way they get better and I am forced to play smarter and at a higher level.
Just don't drop out of the scene completely, we need anyone we can get with Melee.