Does it cost anything if I register on and log-in to your site (https://www.keycaptcha.com)?

It will cost nothing.
You may use free version of captcha, it has the same secrity level (KeyCAPTCHA demo free-version)

How long does it take for you to moderate custom images?

Usually it takes not more than one day. We are not in office all the time.

Hi have been running your system on 2 forums, and it's been great -but the last 7-10 days one forum is getting hit with Movie DVD spam. It appears 2 bots register then dump 40 posts into the forums of Movie DVD titles. I'm pretty sure it's bots. I have a tool that catches the key words of their spam sites and places it in a moderation queue automatically, however it's getting old that they keep sneaking past my captcha. Have you seen anything like this? Thanks

If you have only two bots and huge amount of spam then it looks like manual registraition and automatic spam (if you don't have human checking on register user post)
For more detail please open support ticket at keycaptcha.com
Best regards, KeyCAPTCHA Team

Hello vBulletin.org Members,

Looks like that the format of our poll (https://vborg.vbsupport.ru/showthread.php?p=2424769) was too difficult to take a part in this poll.

This week we will update our poll and publish a new link to a page where everyone will be able to vote.

In any case the poll ending will be postponed till the end of July.

Best regards,
KeyCAPTCHA

Hello vBulletin.org Members,

The poll is available here. Voting ends on July 31.

Best regards,
KeyCAPTCHA

Why should we pay for something when there are tons of free working interactive captcha's??

You may use it fo free.
https://www.keycaptcha.com/products/

Regards, KeyCAPTCHA Team