Alonya -I did have enough drachmas, 7000, in fact. I should have been able to make the best value purchase with my drachmas but the game acted as if I didn't have enough by taking me to the credit card page. Perhaps there is a very long delay of many hours before the game recognises recently acquired drachmas, which of course is no use if the offer lapses before the game recognises your drachmas. Having said that, the top right of the screen correctly showed up my 7000 drachmas but still took me to the credit card page instead of accepting my purchase of 1000 upgrade sketches with my drachmas which were sufficient.
Kakos - perhaps it worked for you because you already had the required amount for a longer time than me. I was short of less than 100 drachmas to be able to buy the best value amount of upgrade sketches and I acquired the drachmas I needed through occupying traders' emporia for short periods before anyone could raid them and after a few hours I had enough to make the best purchase but the game wouldn't let me, so the acquiring of a few drachmas via emporia turned out to be a laborious and time-consuming undertaking for nothing. The fact that there was an emporium mission on at the same time as the sketches discount didn't make it any easier as more people raid then and make it even harder to obtain a few drachmas so I was pleased when I managed to acquire the amount I needed despite the difficulty, but disappointed when after all that effort the game didn't accept my drachmas for my intended purchase.
Prometheus - thanks, happy new year to you too. Thanks for the suggestions
