Distributing by torrent is different from providing a quality download service with purchase. If someone really wants to download by torrent and wait then what's stopping them from paying and then doing that.

Limiting number of downloads protects their bandwidth from would be jerks. Protecting their service is important for their customers to have a quality experience. It's fair, and most people will only ever download once. If they for some reason use up all 4 downloads and want more they should e-mail them. Why wouldn't give more if some had a genuinely good reason for using up their downloads?

Torrent != copyright infringing downloading. What the commenter you're replying to meant was something like what Humble Indie Bundle did - after you buy the bundle, you can also officially and legally download it using bittorrent (as opposed to HTTP), not hitting their servers but rather volunteers.