Why? Because it's more of an achievement. I like the challenge of it. IMO, there's no point to a game if everything is handed to you (or bought).
"You have to keep in mind that many people work hard to make UR available for you to play, and they all need to eat and pay bills."
Yes, but this is a free game and there are plenty of players willing to spend their (or their parents') money to support them already.
There are several highly active players who have nearly full collections and the skills to back it up in this community.. that have spent a minimal amount of real money (zero or near zero) on this game. It is doable, but not on a casual basis.
unlocking the market is the key ($2???).
The game experience becomes far better with a small investement to simply unlock the market. Offers and videos generate some revenue for UR im sure, so doing those while not using real money helps UR too
Definitely a good point -- offers and videos are a good way to support UR, even if you don't have a few bucks laying around. I would still encourage anyone who is able to put down a Buck or two on this great game, though. I mean, you can obtain a small fortune in cards for the price of movie tickets for yourself and a friend. The movie will keep you entertained for under two hours, and UR will keep you entertained for months or maybe years.
I appreciate the fact that many people want to be able to play UR for free because it says it is playable for free... But the developers work hard and deserve your support.