The RNC is spending all their money to help fellow RINOs like Murkowski win.
Mastriano is fighting against Dems and RINOs on the national and state level. Jake the Snake Corman hates Mastriano/MAGA and will not lift a finger to help statewide. You even have PA RINOs calling Mastriano an 'extremist' for questioning the 2020 election and are publicly pledging to vote for the Dem.
The RINO swamp would much rather see a Dem win than to have 'their' party taken over by MAGA.
Both parties operate on the principle that candidates have to demonstrate fundraising strength before getting big investments. Mastriano could have used his money early on to raise more money. Instead he posted boring Facebook videos that no one wanted to watch and showed up at tiny events where they kicked out people who wanted to talk to him, not just the media.
Lots of candidates will take out a loan early on to give themselves a boost to raise more money. Not sure if he did that.
But even Trump so far is holding his powder. That should say a lot about whether Mastriano is doing things correctly. He did a short phone call this week, but hasn’t donated anything from his $100 mil stash that I am aware of.