FWIW: This may not be exactly on point, but we dealt with excess captchas on student accounts at school recently and was able to track it back to too much password traffic changes in our domain. To get around that, a password procedure and handling change was implemented and we have not seen any captchas since.
The point here would be if the email address you are currently using to access WorldMark is of (on) a highly used domain (thinking gmail especially), you might be having to fight the captchas for a similar reason. Can you try changing the email address you currently use on your WorldMark profile to a less used domain? In my case, I use my email from my local ISP - not a gmail based account....
Not saying for absolute confidence this will solve your problem, but it would seem logical to consider....
Good luck.