Unimportant, all I can say is, um, well...clearly there appears to be a serious disconnect there somewhere.
50% net after printing costs is a virtual guarantee the author will never receive a penny.
it's #2 that has me scratching my head. Ten percent of the cover price, let's call it $10 would mean the author would receive $1 per sale according to the way I learned math, but that sentence says they'd get $1.50. Now, I'm assuming that's also net, meaning after printing costs, etc., which would also mean the author will likely never see a penny. Now, maybe they're saying you'd get 10-15% of the cover price per sale, after net costs are paid. So, if you sell a thousand copies and net costs are paid, you'd get a check for between $1000 and $1500 and either ten or fifteen percent per sale thereafter. This is, of course, pure conjecture on my part.
Nevertheless, I don't like the terms. They're vague, subject to interpretation, and the whole "net" price thing sends me saying "No, thanks."
Contract terms should never be vague or subject to interpretation. Publishing terms should never be vague or subject to interpretation. The terms are either this or that, not both or neither, not open, not vague or subject to interpretation. The language is pretty easy actually, and any publisher ought to be able to use it sufficiently well to get their terms across on a website.
In my not so humble opinion, of course.