Their price is probably even more defined than anything else. Ofcourse you can use them as collateral. Anything that be sold can be used and they're the easiest to sell hence the least risky for anyone offering a loan.
No they aren't looking for assets of the club. They aren't planning to strip mine the club unless that's the kind of buyer you want. They're looking at multiples of revenue and revenue potential based on clubs of equal stature as us.
We made over a 100m last year. A 2x multiple for a club isn't high. I would value us at closer 400 so you are lucky I'm not the one in charge.