The (broken link removed) shop at Target, the (broken link removed)shop at Costco and we all know they are both multimillionaires. Besides a millionaire needs a razor blade, some bleach, laundry soap, ect where exactly do you think a millionaire would buy something like that if not Target, Walmart, Walgreens, ect?
Some people also become wealthy by saving their money and not spending every dime. Even those who may not have "high incomes" can become millionaires by watching their money, investing it well, and not spending every dime that comes into their house hold. Live below your means! I'd also like to point out that most millionaires live in houses that cost less than 300K that are paid off, are debt free (no credit cards!) and drive used cars. ((broken link removed))
Aside from that I think it is ridiculous to assume that anyone should rehome a guinea pig, or any animal for that matter, in its twilight years simply because that person does not want to bring another one into the household. A guinea pig is a social animal, true, but a guinea pig also knows its people, its home and its routine. The people probably also love the guinea pig even if they do not want to get another one. The likelihood of a senior animal getting adopted out is low for any animal type. There is also no telling that that guinea pig might have health problems. I know my oldest guinea pig when he passed at 10 had pea eye, was loosing his sight and had a lumpy tumor. He wasn't exactly what a new owner would be looking for. Should I have given him away just to have him languish in a rescue until he died? I find that more cruel than loving him well until he passed.