I haven't verified, but from what I can see, they changed it in the remaster. It goes up now every other level past 50 (+500 to XP, +8000 credits, and +2000 resources), and the original max bonus is achieved at Level 56 (and remains the maximum bonus all the way to the level cap).
There is definitely not enough XP in the game to reach max level in a single playthrough. The curve for the last 10 levels is huge (and dwarfed by the curve for the last level alone).
Ok, importing at level 57, i received: starting level 5, +4000 XP, 190 paragon (was 100% paragon, 0% renegade in ME1), 150,000 credits, and 10,000 to each resource. Is that the max bonus?
Yes, that's the max.
You also received 100K credits from the import bonus (the remaster transfers 10% of your credits, capped at 100K with the new patch), and 190 is the cap for paragon/renegade transfer.
Once you unlock the achievement for completing the game, new characters and imports will start with an additional 200K credits and 50K of each resource.
Yeah, it might not be retroactive. Who knows.
I did verify that it works on a fresh character, at least when you cheat a bunch of XP in with the console.
But as long as you can hit Level 56, it doesn't really make a difference. The extra talent points wouldn't have been useful, and it doesn't give any additional benefit in ME2.
