By convention, file size units use either a binary prefix (as in megabyte and gigabyte) or a metric prefix (as in mebibyte and gibibyte).
Summary: the best advice is to find a combination of the two. You test the site to see, if it really works and if it is worth your money. They may either do the matches using their matchmaking system, as it is with e Harmony dating site.
Then you make the next step and get paid membership with all the benefits it offers. Besides the free or paid types of dating sites, there are some widely or narrowly targeted dating websites out there. Or, they may work as a sort of dating social media, where people can free contact anyone in the system.
This may work well for you, but on the other hand it may offer extra challenges at finding the right match.
That is why some paid or free dating sites work in niches.
For instance, they may have age limit or location limit for their members.