What sign up ratio are you getting or what do you expect to get?
These sites are only good for new domain parking that you won't promote.
If you want to make any money you need dedicated dabbling will only lose you money even if it is $1 invest in yourself and spend more as any little success will see your site locked up or paying more dollars in additional penalty bandwidth.
$1 will get a domain hosted and it will only take one of the hundreds hosted to crash your site too.
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