I think you’re right. The GOP sells out social conservatives every chance they get. For example, you know they’ve wanted an immigration amnesty for years. They’re not even all that fiscally conservative. Standing firm on tax increases while doing absolutely nothing to reform spending or slow the accumulation of debt is NOT fiscal conservatism.
The spending/debt is a little tougher. That's where we're dealing with the voters looting the treasury. It seems we're still at the point where any politician who wants to cut anything will be run out of town by the recipients of those programs. Supposedly even the business interests in Arizona campaigned against Republican Jeff Flake because he's a staunch fiscal conservative who is against unnecessary spending including corporate welfare. But he did win and he is one of the minority of good Republicans on the taxpayer's side.