Actually, most people who do the welcome tutorial buys a pet. You can't really complain that you can't have more than one out at a time, since there was never anything that said how many you could, and so you had just assumed it.
Pets will stay at 1 out at a time, mainly because in a hub with 80 players, 15+ game mobs, and hundreds of other entities like karate pig and cows, you will lag .
I would disagree with that most people don't buy pets they think it is a waste of gems. at spawn you don't see a lot of pets they should do something so pets are better and u can use your second one like pet games and maybe have 2 pets out at 1 time per person?