Firstly sorry we didn't reply quickly as anticipated.
The 25:1 is accepted currently during this week at that rate because the current rate of DarkSilk is $0.25. Because we gave Silk the rate of $0.01 this makes it 25:1.
If you look at this:

We state here that we have looked at the CURRENT market and how it stands, Silk was at $0.007 at the time and we offered users to buy in at $0.01 as the DarkSilk ICO hadn't had much traction and DarkSilk was and still is at the minimum price cap of $0.25, thus giving the current swap ratio a 25:1 scale.
If we were to take millions in ICO funds, the DarkSilk price cap would increase to a maximum of $2.50 at which point Silk would be at the 250:1 ratio.
Sorry if the post in the OP's of both threads didn't explain this as clearly as intended and will look to have this updated and improved upon ASAP.
.
.
.
.