Some abilities just aren't worth 1 RP. But you can't make them cost 0 RP either. Do we need fractions? Or perhaps something like "For 1 RP, select two of the following abilities"
Two things that come to mind: Stonecunning and Greed. Then you can make Hardy cost 2 RP, if we're determined to aim for 10 RP for all core races.
Stonecunning: Dwarves receive a +2 bonus on Perception checks to potentially notice unusual stonework, such as traps and hidden doors located in stone walls or floors. They receive a check to notice such features whenever they pass within 10 feet of them, whether or not they are actively looking.
Greed: Dwarves receive a +2 racial bonus on Appraise skill checks made to determine the price of nonmagical goods that contain precious metals or gemstones.
Hardy: Dwarves receive a +2 racial bonus on saving throws against poison, spells, and spell-like abilities.
Best way would to rework the abilities not trying to aim for 10.Weakest would be 1, strongest could be 5 or 6.
The core races are not equal and as long as they try to make the numbers match, the math will be flawed.
It would be easier to double all values and aim for 20 RP than to add fractions.
Then we just start getting arbitrarily large number, but you may have a point. Some things DO need to be fractional (or the equivalent thereof), if not the things he identified.
Do not do a base number, until after you have all the core races. Which will most likely run from 9-15 or so. Which gives you a base window, not a hard number.
Stonecunning is worth at least 1 RP, in my experience; the auto-detect traps and secret doors ability is great. I agree that Greed is definitely worth less than 1, though.
Hardy is worth at least 3.
When I did my own system, based on several of those out there, I costed everything at somewhere around double these, with 'standard' being between 20 and 25. Then divided by 5 to get 'point costs'. Fractions would work much the same.