Its not really difficult.
Say there are 1,000 tickets available for sale and all of them are sold to STHs for $100. Now say that only one of those tickets are re-sold, how much do you think it could be re-sold for? Say two of those STHs decide to re-sell their tickets, how much could those go for? 3, 4, 1,000?
You seem to think that the black market value = the actual market value when, in fact, the real market value is roughly close to what the price the tickets are sold to STHs for - the market for 1,000 tickets - not the couple that are re-sold. Sure, they may be sold for a black market value but it is neither fair, nor legal, so don't use the word fair and black-market in the same sentence (I noticed you decided to use secondary market instead but point still stands). In the last sentence you also seem to think that MLSE doesn't price their products aggressively enough, or that there is more money to be made from ticket sales. Why don't you apply for an executive position there then.
As for the 2nd bolded, no, if one person is willing to pay x10 more than the masses the highest bid is not the market value. Thats one being taken out back and around to the cleaners