Well, technically they've bought the club for 23mil + 20mil debt, so 43mil.
Not quite sure how you think a midtable premier league club can't make a decent return on 43mil to buy to be honest. You get money for the final position, cup games, tv money is INSANE for every club in the league. Some of the lower end clubs are actually pretty profitable, the ones that keep a sane wage budget, younger squads or less famous squads have the potential for pretty huge profits. PRoblem is most clubs get in the league spend millions upon millions to stay in the league and overstretch themselves massively.
31k capacity stadium isn't half bad either, better than a lot of teams in the league.
I really can't understand how the club cost so little though, 43 mil total seems ridiculously low. Were the current owners desparate for the cash? Blackburns revenue must be way higher than 43mil. Utd would cost 4-5 times their yearly revenue to buy out, as would most clubs.
From what I can tell Ashley bought Newcastle for £134 mil before he paid off huge sums of debt, which were WAY higher than Blackburn had and the club was on the brink of going under due to the debt(it was around 100mil wasn't it). So Newcastle were basically more desparate with way more debt, yet cost not far off 6 times as much.
Get the feeling Blackburns previous owner was very very desparate for the cash for something else, saving another business or something maybe. Hell, surely the stadium alone has to be worth a lot more than 23mil, seems very very strange.