Just a small point - I understood its the wage bill that is measured (not transfer fees) - Edgar and Sammon won't be playing for free. Higdon was probably on at least £8k p/w (based on his reported wage demands at Chesterfield) and I doubt if Oldham are stumping up all of that.
Yes the owner can inject new funds ( I argued last year that the correct division for large sum injections is League 1 because the turnover calculations for the Championship don't allow cash injections to be treated as turnover). The rate of investment would have to be in excess of the money spent on wages though to stay within the FFP 60% of Turnover guidelines for this season and avoid penalties (fines, transfer embargo etc). In my view the incoming players have to be able to do a job in both divisions or we risk being saddled with players not good enough for the championship but who will be drawing significant wages for at least a season after this. At the moment attracting players of that level isn't easy as the players will look to play at as high a level as they can and few will make the drop to Div 1.
Promotion to the Championship will net an immediate £5m revenue from the Premiership TV money next season (plus extras - gate receipts, own TV revenues etc) which should offset the need for continuing cash injections to fund this season's "extra" expenditure, but the reality is that most Championship clubs struggle to manage the spiralling wages required to mount a serious challenge.
Championship clubs combined revenue was £491m last season, however, these clubs paid more in wages (£518m) than they earned in revenue.The wages-revenue ratio in the second tier was 105% in 2013-14, compared with 106% in 2012-13. This resulted in operating losses of £222m and a combined pre-tax loss of £247m. The Championship ain't cheap and premiership parachute payments (going up to £80m over 3 years) will conspire to keep it that way.