Bond>TH Keys vs Real life money>TH Keys

So i'm looking at buying a few keys, just 75 for now and in GBP from Jagex they cost £13.99

So basically my question is would it be cheaper to buy gold @ 0.32(I know I can get it cheaper I'm just using the food4rs banner as a guideline) and buy bonds then keys, or buying keys straight from jagex?


I did some math and this is what I came up with, although my maths is pretty terrible, hence why I'm asking you guys!

1 Bond is 15 keys

I want 75 keys so, 75/15 = 5, meaning I need 5bonds
Bonds are currently 9M rs3, so under the assumption they will insta buy for 10M, I need 50million RS3 gold to buy 75 keys

Gold is 0.32/m which is 16$ for 50M, in gbp this is approx £10 - £11 at worse

So yes, according to my calc's buying with RS3 gold would work out cheaper

Can any of you see a mistake in my maths?

 

Most of the time, buying gold to pay for bonds used for membership/keys, is cheaper than directly buying them from Jagex.

 

buying bonds is cheaper

 

Oh yeah i had never thought of buying rsgp to buy bonds>membership. Thanks!