So the reason you have to earn 300 rep to post a link is because of spam? Why 300? Can't it be lower, like 190? Do spambots give up just before reaching 300 rep or something?
If there is "enough spam already," as you say, obviously, it's not stopping bots or people who want to spam. They are going to find a way to do it if they want it bad enough. It could be 500 rep and it wouldn't matter. So why not lower it then in the benefit others?
It's been a while since you were a new user. To you it's easy to gain rep because your experience allows to make many helpful replies throughout the day, post a tutorial to explain how to do something, you've already logged in 10 consecutive days, or whatever else you did to earn all your rep points. Making that first 300 rep isn't easy for someone who doesn't know how to do it, and it's a lot of extra effort just to be able to post a link. There's some irony in saying you can "Create games easily" with Construct 2, but you have to work at getting enough reputation to do something as basic as post a link in a forum.
All I want to do is get a little help with my game using Construct 2. I don't want to spend hours playing forum games for rep points just to post a link. There are better ways to stop spammers and that won't impede new users.