Why aren't there more (any!) 'a la carte' agents out there??

[Kelly G.]

This is kinda a poll - more than a post.  I'm curious to know why more agents aren't willing to work (when they can under their broker) or why more brokers don't allow their agents to work "a la carte" - or a fee for service structure.  There are clearly far far far more agents than transactions out there.  Yet I can't find a broker/agent willing to do a 'fee for service' type contract.  I'm really curious as to why an agent would not offer their services (negotiation strategies; staging guidance; reviewing offers etc etc etc) on an hourly basis?  I'm not talking 'chump change' here - I'm thinkin' $100/hour for 'consulting' services.  

Enlighten me please . . .