Selling and delivering real-time data seems to be the focus of practically all large data vendors, but I am more interested in acquiring large sets of historical daily data covering, say, 5.000 instruments (equity, rates, fx, commodities, etc) about 15-25 years back. It does not seem to be a priority for any vendor to deliver such a service - is this true? It would seem like an interesting set to mine.
Please note that I am not asking for a free service - I am aware of the typical free sources, but calling them repeatedly seems like a hassle and besides, they often have greatly varying time series lengths depending on the instrument.