It's funny you bring this up because a startup i was involved in at the beginning did something similar. I was one of the seniors and we would have proposed "ideas" for what could be done with the product. The next day the sales people were selling those features .. unfortunately it created a huge divide between sales and development that ultimately couldn't be overcome.

I understand the insentive is to sell, but there has to be a balancing line between sales and development, both can't work solely independent.