Just an example:
When we talk about SO, I agree with the reasons stated here to explain why question upvotes grant only +5 rep instead of +10, but Meta is different:
1.- Answers have more intrinsic value than questions, and the reputation balance should reflect that.
On Meta, in cases like posting a bug, suggesting improvements or proposing new features, the question itself is IMHO much more important than the answers, especially if it's upvoted, as Meta's voting logic is different to SO, and almost every upvote to a question means a user agrees with the OP.
2.- The question asker already enjoys a substantial benefit beyond reputation gain from upvotes on their question — namely, they get great answers to their question!
On Meta, especially in the cases stated before, answers don't solve an asker's problem, but a site problem or a possible improvement, so this point is not true, or not as true as it is in SO.
3.- We want to discourage question asking a little bit, and make sure that people who ask questions are doing it for the right reasons and not to generate reputation.
I think this point fits to SO but not completely to Meta. Asking something in Meta, especially proposing an improvement or requesting a feature can be a risky business (for your rep). IMO, these type of questions (and bug detection) should be encouraged (similar to creating a non-stop brainstorming).
I'm not sure if this is possible or if it would be a headache for SE developers but IMHO, just in Meta, upvotes to questions should gain the same rep than answers. And more generally, reputation should work differently on Meta.