hey jship, I took this from reddit and I couldn't have said it better myself, their limit was $15, but some people sent out way more than $15. A few people on reddit received hundreds of dollars, some received iPads and computers!
"The Reddit Secret Santa is about giving. The amount of $15 is just a recommendation to help set basic framework for a gift exchange. The monetary value is both to ease an undue burden of expectation on the part of the giver, but also to help set realistic expectations for the giftee. Having said that, many people are blessed, willing and able to spend more. Many people are also on strict budgets, and while the cash flow might be low, they have been blessed with talents and creativity that money can't buy. The point: use your gifts, talents, and blessings to create an amazing experience for a fellow Redditor. The memory you create will outlast anything else."
So don't worry if you feel your gift didn't go over the limit since it shouldn't have
Whoever got your gift is probably really happy!