Yes, I would actually take it a little bit further than just adding flavor shots. I would buy a 236ml of
e-liquid at double the strength I vaped at with 5 flavor shots, add a 236ml of VG and a 15ml of flavoring of the same e-liquid.
Mixed it all together, got 487ml of e-liquid for a little over $40. I always had another 15ml of flavoring to add to my liquids too - it worked a treat. So yes, getting their flavorings is an inexpensive way of customizing your e-liquid to your preferences.
Now if you want to take it a step further, you can actually buy your own nicotine base (from them, but there are other vendors where it will work out less expensive) and add in MBV flavorings to make your own liquid. If you are interested, post up and other forum members and I can give you some tips.
I don't vape much MBV liquid these days, but they helped me a lot through my early days of
vaping and trying to find an all day vape. Their customer service was excellent too.