I can not say that you have to worry about RP mining at a POB solo. Because if it is a good POB there will be every now and then an oportunity for RP, with other Traders, Miners, or Pirates, after Pirates with Authorities etc... Then you have to make Traderuns to sell if the POB is full, many RP oportunities again... With Pirates or with Escorts you can hire. If you know there are Pirates around, hire a Player in New York as escort is really good RP if you find an veteran who is interested, which is really possible if there are hanging around some Player in NY. Entertaining Stuff, and less solo as it sounds! And between all this relaxing mining and listening to good music.
edit: if it would be onley for the money i would have stopped long ago, cash will get quick a secondary thing if you mine a bit... depends on everyone as person, but i have still fun with mining combined with hauling.