Richard...
I hate to say it, but I do agree with the predominant voice here that you really shouldn't say what you paid for it initially.
It has nothing to do with the economy, and everything to do with "good business practices". There are two things you NEVER tell potential customers, or competing business men (or even your employees for that matter).
1: What your markup is on products you sell.
2: What your salary or wages are.
If you outright tell everyone what your markup is, and if it's something HUGE like on this Hoover, then suddenly everyone turns on you and questions how much you mark everything else up as well!
Let's face it....you can't blatantly brag about a 797% markup and then expect people to take you seriously! Had you simply posted that you'd found one, and posted the link to it, then it would be a different story, but since you stated what you actually paid for it, people are definitely going to wonder.
I completely understand your need to make a living (and I'm sure everyone else here does too) and I can understand marking things up, but you simply CANNOT post what you paid as well as what you're selling it for and expect nothing but syrup-y sweetness in return!
It's your prerogative not to post here (and I think you should reconsider), but keep in mind what's been stated above. It's just good business practice NOT to tell your inside scoop to potential customers.