Just as a little FYI, the supporting of Chafee by the national party will probably have little effect monetarily on the other Senate seats that Republicans are trying to hold this year.
Santorum (PA) certainly can self-fund. So can Talent (MO), DeWine (OH) and Burns (MT), though DeWine and Burns perhaps a little less so. Down the scale, Allen (VA) certainly can and Corker (TN) will undoubtedly be spending his own money soon.
Where this has any effect is on potential Republican pick ups, like Kean (NJ), Steele (MD) even though he has a lead in cash-on-hand right now and Kennedy (MN).
This is true, though the NRSC has the added benefit of being able to run really nasty negative ads without the Republican candidate having to say they approve of the message. So this makes NRSC money at least somewhat important.