Coinbase.com

I opened an account with this place because I gathered from reading it may be the easiest and fastest.  This was about a week ago.  My account is verified and all.  I have been trying for about 4 days now to purchase a bitcoin or two.. The problem seems to be they have a limit they themselves are allowed to buy per day.  Does this sound correct?  There was no warning about this nor can I find FAQ to find out if this will be an issue going forward.  Is this a real issue?  IF so do they have a "wait list"?    Is this prevalent across all bitcoin companies?    When does the day start for this company when you can purchase?  Is there a standard start of each day for this market?