Cynically, I believe another motive they might have - by trying to make their software appear that most users love it, they will be asked back more frequently onto GOTD (if it worked like that).
However, as with the users, I am sure the GOTD team are aware of such tactics also. Anyone who is paying attention can see what has happened.
You only have to look back at 10 or 20 past giveaways to get an idea of the typical proportions and the total number of votes each days giveaway attracts (or giveaways involving rippers/converters in general). When you consider that these "typical totals" were exceeded in the first hour or two of the giveaway, shows that they were not increasing at a typical rate - or in proportion between yes and no votes that we usually see. To have 1000+ yes votes, and 30 no votes only demonstrates that the voting isn't being carried out by 1030 different users.
Secondly the (automated?) rapid jump to 1000+ yes votes in the first couple of hours - and then to see it almost completely drop off (currently 15 hours into the giveaway), combined with download levels/per yes vote during those first 1000 votes - was at a record low compared to usual.
So compared to past giveaways - there were a lot of people voting "yes" but that didn't convert into a typical ratio of people downloading the giveaways. Go Figure.
For me, such tactics are nothing more than a time waster, because I pay no attention to the voting in considering the merits of the software - but it does show in a bad way, the voter(s) who are trying so hard to make aiseesoft products look as popular as they can. Problem is they try so hard - it just looks totally fraudulent.