Nice article...good to find one that's been bumped up.
As far as flipping, the bottom line is to enjoy what you're doing.
I sold about 6 bikes last year during one of my 'bike'' obsessed periods, and did real well on all of them.
Living in Florida is a good thing, because people bike all year 'round.
Most people in these parts don't have real deep pockets, so a basic single speed coaster bike is what most of them are looking for....I've converted a bunch of mountain bikes or mixte dual purpose bikes into single speed. No hills here, no need for shifting gears...besides, who really want's do deal with derailleurs anyway. lol
Now, it's a year later, and I'm starting again....I look at it as a way to get paid to learn another new skill.

The more bikes I tear down and rebuild...or even paint, the more I know, I gather bike tools as I need them. and it can be a profitable, fun JOB even...as long as you have patience and can hold on to stock for a bit. Most bikes sell on Craigslist, for sure.
I also have an online shop, but that's for other stuff...vintage stuff



It's way more important to enjoy every day and get into what you're doing, don't bother chasing money, or trying to be the big headed bike man in town, every place has a few of those nine irons around.

Have fun...life goes fast..
Franco