To an extent, you've answered your own questions.....
As you say, we survive by being a selling club - your investment as a season ticket holder is part of that survival, but with the size of our support there is always ging to be the need to sell players and (hopefully) bring on replacements.
McGhee's mentality in not signing up players is clear - he had no intention of still being here, and hoped to take some of them with him. He has not been working for us for months.
Sometimes it's 2 steps forward and 3 back, but sometimes (like the last couple of seasons), it's 3 forward and 2 back. It's part of the deal when you support the club, and not individuals.
Players and managers may go, they may be missed in the short term, but we have lost better players than those going now and become stronger. We deal with it and move on.
Certainly, with the potential loss of TV money things will be difficult, but I support Motherwell, not any individual who happens to play for, or manage, or even own, the club for a short period. Whatever is necessary for the club to survive is OK by me.