>>> b) they have more resources to burn. If they throw 10 people on a large deal and it doesn't go through the company itself typically isn't hurt that much (the reps, that's a different story).

Basically, you're saying that your company is flimsy and doesn't have the resources to execute a sale. It's probably not the impression you want to give to clients ;)

MSFT/Oracle win because they have a) decades of experience in selling b) branding c) already in the door of most companies.