First off, I believe that witchcraft is real, but like others have mentioned on here, even if it did work it would not permanently bind someone to you so that they love you forever. A spell is also like a prayer and is not guaranteed to give results. It is actually against the law of wicca to manipulate free will in the first place so that would indicate that if one were to do so, it wouldn't work out in their favor in one way or another.
Obviously 99.9% of online spell casters are not doing a single thing except pocketing your money. I use to use
www.calastrology.com a lot because they give you a refund if nothing happens within an entire year. Whether they are actually casting spells or not is something I will never know. I tried ordering many love spells on past POI's and nothing happened. Later on I realized that they were never right for me to begin with so I was very happy that nothing happened, so I don't know if they just weren't doing the spell work, it wasn't effective, or if the universe just didn't want me to be with that person. I spent hundreds of dollars more than once on calastrology but they refunded all of it to me.
You're far from alone. It's really no different than using the psychics. The idea of love spells to solve your heartache is very alluring and if you believe in psychics, you're probably going to at least be open to the idea of witchcraft too.