If a content merchant offers a freebie and I take the time to download, install and use it and then decide I like it and it shows good quality, then I will be positively influenced to purchase from them.  It's like the food-court vendors at the local mall offering little sandwich-samples to passersby.  Next time I may decide to get that sandwich.

 

I avoid the not-for-commercial-use freebies.  They are a time-bomb in the library.  I do not have thime to back-track and check the terms of use if I decide to use it a year after I installed it.  If a merchant offers a limited freebie, I not only will avoid it, I possibly will not buy anything from them because they atracted my attention for nothing.