Well, expensive is relative...
If the state of tritium mining doesn't improve, I certainly prefer to spend 1 hour of my time buying maybe 5kT it in a station (even for 40k/T) than spend maybe 20h mining the same quantity using SSD.
Credits are only useful in the game, so why not use it to enjoy your gameplay ?
Absolutely right.
Math behind this is very simple.
You can mine 250t Painite per hour in any bigger ship that can handle 4 mining lasers
and sell it at 980k/t what gives you yield worth
245.000.000 per hour
for 245mil you can buy about 6.200t Tritium at 39k/t.
We have to add time for selling Painite and buying Tritium of course.
You need about 12 minutes per batch.
Last time I had to sell in 230t batches to avoid price drop:
(some intervals are larger then 12 minutes, because I was wasting time on some forum probably)
6 x 232t of Painite, at 215k per batch (average from table) is 1.290 billion worth - you can mine in in 5 hours.
I will count 6.
plus one hour for selling
For that you can buy 1.290.000.000 / 39.000 = 33.000 ton of Tritium.
Then you buy Tritium. Type 9 can handle 752t at once:
Interval is the same - 10 minutes minimal, let's assume 12.
Well, we can't fit 33.000 Tritium in any FC, so we have to assume we buy half now, half later. FCs have modules that take capacity anyway.
This brings us to 6/2 = 3 hours of mining Painite, and 30 minutes to sell it. Plus jumping, we round it to 4h.
The worst part is buying Tri : 3h painite mining is worth
645 milions
645 / 33 mil per 752t Tritium, batch = 19
We round to 20.
20 rounds x 12 minutes = 240 min = 4h
All in all we have 4+3 = 7h of gameplay to get 16.500t of fuel for FC.
If we had tried to mine it, it would take : 16.500t / 200t/h /current SSD mining hourly yield = 82,5 hours.
7h vs 82.5h
Better choice is obvious.