I really feel you would drive more sales by actually having a longer trial period for the plugins as I find 7 days a bit too short
I realise the modules are not horrendously expensive but they are also not very cheap to make it into my impulse buy list!
I must admit to grabbing the cpanel_extended module but still not having realy got it to run how i want .. although that comes down to my sporadic bursts of reconfiguring servers etc
I am interested in some other modules but simply would not activate a trial as I *know* I would not get anywhere in the next few days to squeeze in time to try them thoroughly .. so i simply would not install them .. if the trial was 14 or 28 days they would already be installed and whenever i get a free 5 minutes i would be working on them rather than waiting for an extended free space of time to evaluate fully .. which usually never happens !