i am seriusly understand you, if you look at my profile you’ll see that i gave away 6 free plugins. but still, without this feature your plugin can create serius damage to people. some of then might not understand it untill it will happen… for example, my client sells coupons. with the free vertion people could have recived free money (copupons) and it would have created some really bad money loose. i had some good luck there to find that issue before he lost too much coupons.
anyway, i think this is really mandetory and your plugin will become much mor pupular that way and you will get more people to buy the pro vertion. at the current moment, i don’t think it’s responsible to use the free vertion.