For "big" clubs to visit dont you have to pay their travel expenses or something? That may explain the lack of high profile friendlies over the years?
Slade: "Hello Mr Wenger can you and your team pop down to Brighton for a kickabout?"
Wenger: "Yes of course thatll be £10,000...hello? hello?"
To be honest the teams that Crawley play are teams like a Chelsea XI, its not gonna be Terry, Lamps, Anelka etc.
More likely youth and reserves no one has heard of.