Totally agreed with the original post! This drives me mad! DH has banned me from going onto gumtree because of how angry I get about the conditions of the rats on there.
I'd like to second/third/etc the people saying not to buy pets from pet shops, they really are awful in breeding a lot of the time, especially for small furries, please please do your research and find breeders where possible! And don't believe pet shops when they tell you that cages are big enough, it's only recently that I've seen the usual shops suggesting the Jenny cages for rats, even then it's very hit and miss.
I hate the general attitudes to small furries and how it's not worth seeing a vet for them and so on. It's so horrible. We spent £30 each month on meds for our big boy and his brother who sadly passed away during an op a few weeks ago. We're at the vet at least once a month with one of our 7. The cost is not insignificant. Then all of the hammocks we go through that need replacing, the toys, the fleece and the substrate. It's lucky that we don't have children in this house 
We have taken in three rats, two from an MNetter who was rehoming them for legit reasons, they were obviously loved pets but it was clear when we got them that they'd done no research about rats what-so-ever before buying them (unsuitable cage, unsuitable hamster wheel, unsuitable food and no cage embellishments beyond the wheel). The third was taken in from a local who managed to piss off most of the local rat community as she had a sob story every time her rats got too "old" (6+ months) but still replaced them with babies. It took us a short while to piece things together but we got there in the end and I was led to believe that she was blacklisted by our local breeder and others!
I'd love a tortoise or a reptile but I can't take them in knowing that my housing situation will change in a few years time. I hate that rats live for so little time but knowing that does make planning around them much easier, not that my at-least-3yo rescue believes that!
Icebeing I can totally give another vote for rats too, I love them. They need to be in pairs at least for social reasons, though I'll always recommend having at least three just in case of emergencies! Start a thread in small furries and I'll happily come and post page after page of cute rat pictures and videos to sway you even further 
tread Tamagotchi's are totally the way forward 
Stasie It's awful how pet shops operate, I'll admit that whilst I haven't bought from pet shops, I was awfully close to it the other week when I saw a rat in a pet shop and we'd just lost Haku. Had I not been at work when I was there with my charge it probably would have come home with me despite me knowing how evil they are because I was so worried about my newly lone boy. There's a rat rescue group on FB and people are constantly posting about rats that need to be "rescued" from P@H and the likes, if anybody dares to try explain that they are making the issue worse by buying them they are shot down. I hate seeing small animals in pet shops, especially when they are obviously distressed, but by buying them you create supply, how people don't understand that I don't know

SoundFury I get the obsessed thing a lot, though in my case it's true 
Mycar
My photos have my blue Ashitaka, my little Himalayan or Siamese girl Sikozu (she's roughly 10 weeks old) and the tiny baby, unfortunately, is not mine, he will be going to somebody else but he is to die for and almost slipped into my pocket at the rat show I went to on Sunday 