Quick question about contribution value

Check, my friend.

Max bundle contribution = Non-bundled contribution * 0.2 + $30

So if your non-bundled contribution is $0, you can give away $30 ($0 0.2 + $30) in bundled games before you are capped.
If your non-bundled contribution is $100, you can give away $50 ($100 0.2 + $30) in bundled games before you are capped.
...
If your non-bundled contribution is $4000, you can give away $830 ($4000 * 0.2+$30) in bundled games before you are capped.

This system is in place so that people cannot just give away bundled games and farm contribution. If you want your bundled contribution cap to increase, you must also give away non-bundled games.

See this and next time, use the Search function to find the answer.