that is not a standard offer, it is a special to generate sales. although i think you can get G2's with 7 years or 0% finance just now in USA, not sure about the rest of range or world offers.
it is not uncommon in USA for outboard makers to do something like this, although not normally to 7 years admittedly.
The reason for this (some research will back this up if you look/care) is Evinrude are miles behind the rest in sales and their shares dropping at a frightening rate last few years. couple that with the fact the G2 is silly money over there, like 6-8k more in the 200 plus range compared to suzuki. they are also trying to buy transoms according to their financial reports to try and compete with yamaha on new boat sales, that is a tough nut to crack for sure and mercury/suzuki have tried for many years and not quite got there. when you factor that in and confidence in their product it makes sense to offer more warranty than the rest as a selling point as they can't/won't compete on price.
they need to try something as their share value has halved in 1 year and the outlay on the G2 development substantial, need to recoup it somehow and fair play to them for trying it with a superb warranty offer and finance offers in the USA atleast.
anyone buying a G2 in EU i'm sure could haggle the 7 years.....worth a go for sure.
i hope that answers your question