Tony,
It is a rule for PFA aircraft that you must operate in daytime VMC. So no there is no such thing as an all weather PFA type. An all weather aircraft would have to be fully equipped with de-ice etc and would cost a lot of money. In the USA you can fly a homebuilt in IMC provided you have an instrument rating.
The cost justification of a Europa will be in the running costs. I am in the process of changing from an AA5B to an MCR01, I will save £3000 per year in fuel alone, plus a similar amount in maintenance. Over 10 years you will save well over twice the purchase price, and you can trailer it home. You do about ½ the number of hours a year so your figures will be different, but it is probably still a lot cheaper.
As far as business is concerned, a PFA type, like a Europa, particularly the nose gear one, will cope easily, apart from the weather restriction.
Rod1