Most Helpful Girl
I think for men, unless you're Chad Thundercock, it's basically a loss of time because the only factor being put in display is superficial: Looks.
In real life you're more likely to put in display more of your qualities, for example charming facial expressions, charisma, good body language etc which gives much more chances for a guy to make an impact on the girl.
On dating sites women get approached A LOT, which makes them ultra selective on the only quality being put in display: The looks, abs, pecs etc of the Dude, making much harder for the regular Joe to get noticed.
So in short I don't think you have bad luck, IT seems that most men have the same luck when if comes to online dating.3THIS IS NOT RELEVANT ANYMORE
Most Helpful Guy
Many people want to look at sites like OKCupid or POF and they are forced to create a profile before they can browse. That profile remains on the site to create the illusion that the site has hundreds of thousands of users when it does not. Some users will not pay for a subscription so they can see messages but cannot respond. Most of the profiles will show you how recently a user was active.
Bearing that in mind, you must message a large number of users to find a few who may be active and interested. I have done online dating twice (2007-2008 and 2015) and had good results both times, but I messaged many women, and I had many first dates/meetings before I found a woman who I wanted to date on a regular basis.
It isn't supposed to be easy so if that is what you are looking for, you will be disappointed and frustrated. If you are willing to do the work, you will probably be successful. . . eventually. You may also need to try more than one site. There are some sites (like match and POF) that seem to have the same set of users so you should try a site that is significantly different from OKCupid (maybe something like eHarmony.)1THIS IS NOT RELEVANT ANYMORE