Buying and holding sites

Something I haven't seen talked a lot about is buying sites from flippa or dp that currently are producing revenue, putting a bit of money into them for SEO or whatnot, and just holding them. Maybe even reinvest a portion of the monthly income from the site to grow it.

I am wondering if that is because:
a) website income tends to fluctuate quite a bit so it is risky to hold them long term
b) people aren't interested in holding 50 sites making $100 a month
c) it is too much work to maintain 50 sites, even when most of the work is outsourced
d) the income claimed on flippa/dp often isn't what the site makes in reality

Has anyone had any experience doing this? And if so, how did it go?

The trend is to buy a site, hold it for sometime and then sell it with profit. If a site has its earning increased by say 2 times or more and is consistent enough, buyer may hold on it if he is not needing some money on urgent basis.

looktothesouth said:

b) people aren't interested in holding 50 sites making $100 a month

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For me that amount of money is very nice thank you - I would not be turning down $60 grand US a year

First of all, it is VERY hard to maintain 50 sites at once. Even 25. Second, half the sites on flippa are scams nowadays