Why can rangers only have one pet?

Why can rangers only have one pet, period? Why can't you change them around? Training multiple pets is important, and useful (there's that whole HP+ vs Damage+ bit going on), and if you want to change your pet you have to go back to square one and raise it up from level 5 (again), which takes hours of grinding, and if it doesn't work you just spent many hours of gameplay for something that sucks.

Also, when people make an emotional bond to their pets, forcing them to give up a lvl. 20 Melandru's Stalker for a lvl. 5 Pheonix or Spider is hard. You get attached to Kitty, and you don't want to give it up.

Why can't you change pets the same way you change your second profession? It would take alot of pain-in-the-butt out of pets, and maybe we can find something better to do with pets than let them die if we don't have to spend forever raising them (I'm looking at you, IWAY).

Pet kennels were asked for already. Many POSTS and I MEAN MANY, have been posted before this one, but it's the most recent.

http://www.guildwarsguru.com/forum/s....php?t=3021600