The only thing you have to pay for in RuneScape itself is a membership - if you want the extra benefits that come along with it. You can play during years for free, without paying anything (but, of course, without the extra benefits of a paid membership).
I don't know about "RuneScape secrets"; but I assume that some other Web sites - not affiliated with RuneScape - ask for money to give you advice. Well, they are probably allowed to do that, but you are equally allowed to pay, or not pay, for this service; you can get lots of free advice on sites like runescape.salmoneus.net, or runescape.wikia.com. The latter is a kind of encyclopedia, where you can advice on all sorts of things. You really don't need to pay for this stuff.
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No, you must pay to get a Runescape membership.
Looking in the runescape manual, that it what it is there for, billing section.
Only if you want to be a member.
rs2members.tk
Runescape is Free to play. Pay to pay is only required if you're going to buy membership. It costs 5.95$ per month for membership.
The Runescape site itself, Do The Following: Runescape Homepage > Be A Member > Click where it says "Membership from 3.50" > Sign In > PaybySMS
$25
$5.95
They can't yet.
It isn't, and it won't help you anyway. Look up a real moneymaking guide.
you still pay 5 bucks