I probably bought 25 Liftopia tickets last year, maybe more, they even sent me their swag package which I thought was funny because it actually said "Here's our swag, thanks for buying tickets".
What I learned:
You have to put in the skiers name and it will be printed on the receipt you bring in, which is handed into the ticket window. I always got a generic lift ticket that didn't identify anybody, but the ticket window will probably ask for your ID to get the tickets themselves as you are the purchaser. I think it states this in the terms somewhere.
Tickets are limited and do get pricier as the date gets closer (in my experience, not by much). The best way to see if they are going to sell out is to monitor it for upcoming weekends and just see when they sell out, i.e., Monday they will have no numbers, Tuesday they will have 8 and Wednesday they will have 6 left at that price. A local mountain here (Bear Mountain) was selling out Friday dates by Wednesday and then they stopped selling tickets on Liftopia at all, everything is "greyed" out.
Which comes to my next point that some resorts don't really deal with Liftopia because they have the clout not to. All in all, I've been paying 40-60% less for tickets regularly but you have to watch what is happening. YMMV.