Why would we want to sell him? Surely we buy to improve our squad, not with a view to selling him on in future?
I can understand small clubs employing the tactic of buying & then selling at a profit but we're not a small club. If we sign him and he fires us in to the Champions League, higher league positions, cup success etc then that potential success in addition to shirt sales, related merchandise and higher profile perhaps in Spain and in the UK is how we afford him plus surely we buy players like a company buys tools to make us more effective and ultimately more successful.
We only seem to sell players on as they decide they want to move to a bigger club which is fair enough as they are employees and they need to focus on achieving the most personally but also for their team at all stages through their career and sometimes the two go in separate directions.
I'm not advocating selling him. I'm saying that to justify a fee that would shatter our record signing, Levy would want a substantial sell-on value like he has with each of our record signings save Bent (whose transfer was broken into add-ons, making his overall package smaller). Even if he did fire us into the CL - which is not at all guaranteed considering five other clubs can outspend us - the entire CL revenue would be taken up by CL wage bonuses, which could even have awful long-term ramifications if those bonuses do not disappear once we are out of the CL. CL is useful for glamour and attracting better players, but it doesn't have a real financial dividend because we just spend it all on wages.
The fact remains that we are not financially competitive with five other clubs in this league, and in fact even the midtable clubs like Stoke, Sunderland, QPR get a little from their owners while Lewis does absolutely nothing for us. Our wages have grown substantially from the time we bought Luka for 16.5m, but our turnover has not. We're not in financial trouble, but we are at the point where we have very little left over after our annual costs (I believe we made under a million in operating profit last year?), which means we must sell to buy.
Resale value, a la Porto and Lyon, is important because it's the only way we have to grow right now. To keep up with the rising wages of our own superstars and rising oil transfer fees, we have to: 1) get better at scouting, and/or 2) increase spending every year, and the only way we have to do that right now is through selling players for higher fees. The only reason Saudi Sportswashing Machine have improved so much is by buying low and selling high, which is what we used to do.
And still do, to some extent, with the problem that we're trapped in a place where we MIGHT be able to get players that could improve us, but that transfer takes a very long time; OR we could spend that money on a bunch of riskier, crappier players who might not improve us but would be easy to get.
The fact is - we don't have the money of a top club, ergo we cannot think like a top club. We literally have to think like a midtable club with ambitions of reaching the top, which means a lot of worrying about where money goes.