If you have the money, people do it. Especially in your situation, I understand how it would make sense. It might not be the absolute *nicest* thing to do since you are holding a spot they might offer to someone else, but hey, you will be giving up that spot eventually--and then they can offer it to someone else. I really don't think it is a bad thing to do. You've worked hard to get where you are.
Your English, at least from what I am reading here, is quite good. Better than a lot of native English speakers I see posting, LOL! I hope you won't have as much trouble as you are thinking you might.