XP to level one? or lowering the bar to level 2?

When playing old D&D (bx, od&d, etc )ou might have noticed that the XP needed to get from level 1 to 2  is the same that one would require to get from level 2 to 3. It contrasts with the further progression that doubles the XP required each level, up to level 9-10. 

This might be a bug or a feat, who knows? It makes no major problem, though I've been tempted to change it sometimes .For example: fighters and halflings get level 2 at 1500 XP instead of 2000, then they have 2500 more to reach level 2 at 4000. It makes the progress more gradual and lowers the bar a little, so the characters can get the first level up (which is the most decisive for dungeon survival) earlier. Magic users can take it at 2000, while thieves level up at 1000, to go for the round numbers.

There is another approach, pointed up by an anonymous person I met on the internet. Which is to have each class start at level 1 with half of the XP they need to reach level 2, so the "double each level requirement" math is fixed. I loved this idea because it makes me think that level 1 characters have a "past" that gave them some XP and made them into the class they have now. This would explain why some NPCs have no class, and the ones they have it its because they bought it with some XP

Curiously, as each class has its own XP requirements, it can be interpreted on some ways. Thieves require less XP and magic users require more, so its a good reason in-game for why there are much more thieves than wizards in the world.

To put it in another way, you can have a 0 level character with no XP and no class. Then, when he gets the XP required to buy the first level of the class that he wants to become (1000 for a fighter, 600 for a thief, 1250 for a magic user), he can "buy" it. If you are not into 0 level play, you can just have the PC start with said XP amount straight away.

Note that they will need double that amount to get into level 2, so we are running into "levels with same requirements" again. What a mess haha. Well, we can fix it rounding them down a little: 700 for the fighter, 500 for the thief and 1000 for the magic user. 

when you become a level 1 fighter and your level 0 pals get jealous