The Vault Admins are able to regulate the number of questions each buyer group can submit per day, per week or in total.
In case the daily limit is reached, you will be able to ask new questions on 0:00 UTC
In case the weekly limit is reached, you will be able to ask new questions on Monday 0:00 UTC
In case the total limit is reached, you won't be able to ask new questions.
When the total allowed limit is reached, you won't be able to ask a new question, even tough there are High priority questions remaining.