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Women tend to use these sites for validation and attention-seeking. Paying allows you to filter-out these people more effectively, so you don't waste your time. There is some overlap between the free and paid users, but engagement and attitude differ a lot. In free dating sites, females deal with a huge amount of incoming messages, so your chance of effective interaction is affected by all that noise.
There's no such thing in paid dating sites, so they perceive it as a cleaner experience, and that's also good for you. If you are looking for long-term relationships, then paying sites are also more aimed at you. Females are more oriented to this goal, and a woman who pay are seeking people that aren't playing around.