I wasn't really addressing the question of credit card interest. That all depends on how quickly the buyer can pay it off- 12% interest, or even 21% interest, is a relative moot point if you're going to pay the thing off in say 3-6 months. If you're carrying the debt for multiple years, then yes, it's stupid.
Originally Posted by JBrunner
I'll amend my original statement then to say "buy the best you can afford", and not carte-blanche "buy the best". Like buying a Rolls or a Rolex or even a Leica or Hasselblad, all mechanical things require service to keep them running properly. It doesn't matter that you can afford the entry price - don't buy it if you can't afford the upkeep. Not as big a deal per se with cameras, which unless used heavily (or very rarely) don't require much upkeep, other items do require EXPENSIVE routine servicing. For example, there are quite a few vintage Rolls-Royce and Bentley automobiles (in good working order) available out there for under $25K, about what I paid for my brand-new Honda Accord. But if you should need routine service on the suspension, well, Rolls-Royce designed their suspensions to require a proprietary tool. The servicing, which is recommended every 50,000 miles or so, costs over $1000 per wheel, and must be done at the Rolls dealer (note the proprietary tool). Rolex recommends a servicing every 3-4 years, which costs nearly $1000.
Please note that I own neither of the above brands of product - they're just cited as examples, point being take into consideration ALL the costs of owning something before buying it.