Looks like the packages are available from you, and others, as Bruce has suggested but his other point about marketing is fantastically illustrated by your link - It is to a dedicated boat sales website.
The new punter with £30K sat in his bank account not knowing that he wants a boat will never find boatsandoutboards instead of adverts for TVR / golf clubs / holidays etc.
I think that his suggestion of marketing through lifestyle type magazines could be worthwhile - unfortunately the cost is likely to make it prohibitive to anyone but a manufacturer.
How many of the trade members on here advertise in publications not connected to their industry?
I have a client with a large ish charter boat in Greece. The vast majority of his charters come as a result of advertising in Country Life and The Field - not from Motor Boat and Yachting.
I know of one yacht broker who advertises in a pilots magazine - pilots also like to sail and have lots of money!
I can't think of an alternative market of potential RIB buyers at the moment but maybe a bit of sideways thinking is worth a try?