Good question!
First of all I would like to make it clear that although the threshold seems high, it is not. Because the average per claim is 50 satoshi every 5 min, you can make 120 claim per day. That means about 6,000 satoshi a day, that means that in about 1 week you get the 20,000 satoshi, even if you are not so lucky and not get the prizes above average and without counting the referral bonus of 30% and the daily bonus that can accumulate up to 100%.
In the worst case scenario you get 15 satoshi if you make your 120 claim per day, in 12 days you get 21,600 satoshi. In two weeks you can make a withdrawal.
After studying a lot, we adopted this tactic to avoid 2 things that can end a faucet soon in its first months.
1. Bots that can cheat the anti bot system.
With the high threshold and the interval between the payments we have more time to detect these frauds.
2. That we pay much more than we earn.
We do not want to get rich with the faucet, but we can not afford to lose money either. So we need to earn enough to be able to pay all users. When a site does not have enough traffic, it also does not generate enough revenue.
That's why we need the support of users to disclose the site.
The more users the higher the income and the higher the income the higher the prizes we can pay you!
1. Can't captcha blocks bots?
2. This does not seem to be related to the threshold.
1. usually yes, but there is always someone trying and succeeding to betray the anti bot systems.
2. The threshold helps control expenses. If we realize that the prizes are above what we can afford, we have time to lessen before breaking our balance.
This is our 2nd faucet. At first, which is a dogecoin faucet today, we use the automatic payment epay system. We had several problems and the result was that in less than 2 months we had to close the faucet with 500,000 satoshi of damage. This system we are adopting now helps prevent this outcome.
I can guarantee that 90% of faucets that have instant payment by epay will close in less than 6 months. And I can guarantee that faucets that have a threshold above 10,000 satoshi last for more than 1 year.
We have the site
http://cryptolist.wixsite.com/cryptolist there you can confirm that most faucets have threshold of at least 10,000 satoshi and the payment is via microwallet. These are the most reliable and long lasting.