To me the main reason I expect him to spend more, though not necessarily pump spending through the roof, is the degree to which John Angelos underspent. Extremely low payroll, nickel-and-dime running of MASN, allegedly changing coaches to save money, etc. Even if Rubinstein were just to increase the payroll to what would be average for the Orioles' market size and revenue, it would be a significant increase. I believe Angelos knew for the last bunch of years that a sale was going to happen, and didn't see the point of making long term payroll investments because they would be obligations a new owner would have to be saddled with and might not want; nor did he want to spend on short term payroll because they wouldn't add value for a future owner. So what did he spend on? Farm system, international spending, infrastructure... things that didn't cost nearly as much as one mid-level free agent starting pitcher, but DID increase the long term value of the team which could translate into a bigger sale price for him and his family.
So Angelos was keeping the team payroll artificially low for his own reasons, and it's reasonable to expect ANY new owner who is in it for the long haul to at least spend commensurate with our market size and potential revenue. And I think Rubenstein is smart enough to see that. So I expect payroll to increase significantly just because if was artificially low, regardless of Rubenstein's net worth or well known philanthropy.
[And I have already gotten tired of typing Rubenstein repeatedly, and then going back to make sure I spelled it right, or at least the same way every time. Sometimes Peter Angelos was referred to as PGA, I wonder if we could use DMR to refer to our new owner. Think it will catch on?]