You won't ever get a massive bargain there, but good luck finding anywhere else in Europe as well stocked. If you want 'average' products, there are many retailers already box shifting these, online or in warehouse style shops.
I am biased as I have known Mark since BassDirect was being run from a converted garage in a farmyard (2008), but i've seen the business grow and evolve in what it stocks and believe I am very fortunate having such a range of top end gear and expertise only 25 mins down the M42.
I am as whimsical as anyone else, and have definitely wasted his time via email and shop visits but he's never made me feel unwelcome. Even when I could see he was busy he was happy to chat to me for 10 mins, asking how my family is, or discussing the merits of the novax fret system etc. As others have said, he isn't going to tell you what you want to hear and may challenge everything you think you knew about basses - but only so you don't buy the wrong product and end up selling it on a bass forum a few weeks later at a big loss.