If you just joined it is a nice thing. Also, you can perform very well, but just do things that deliver very little points. For example, patrolling with a APC through the base, killing any SBH is a very strong play, preventing a real threat. How many points does it give? Next to nothing. In games where your GDI ref is gone and you don't have any base defense (anymore), you will have to patrol a lot for all the people trying to infiltrate your base. They should be able to gain some money from the people only playing for points for an effective team.
On the "pure" gamemodes, I can remember that there were some starting credits, endgame beacon was optional but most servers had it on, money crates (I think 100 every crate but not sure) and that was it.
I'm conflicted about the random weapon spawn but I think it wasn't on by default.
With Renegade-X it will be different. With the server side options, you will have to create a standard, or possibly several standards. The mods in Renegade have changed a lot of what is accepted, creating new possibilities. Just like you put 5v5 and 10v10 matches in a different statistic, you do the same with the several "pure" standards.
That's a pretty good point with donating to base defenders that would otherwise be unrewarded for performing important roles. I suppose it is just a matter of 'league rules', so to speak, as you alluded to at the end.
I'll be interested to see what leagues/tournaments arise and what their rulesets are (which luckily are easy to regulate with server options).