I myself went first for 6 upgraded ray of lights + 3 electrocutors. After that I build rol-hope and slowly worked to steadily upgrade the deck. - Once I had fully upgraded rol/hope I simply waited till I could buy instosis and bought that..
Farming 9 upgrades through (about 14000 cash in total) is quite easy - I found that easier than to annoy myself with LA.
I can echo that. I just went 27 games (skipped or lost) before winning one with unupped LA. That alone was very disheartening and I can totally understand why I was supposed to have 2-3K + electrum (per another post) just for bad days. That amount is a lot for me at this stage. I sat down and grinded with the cheap AI3 rush death mono and life mono decks for 1 hour each. Regardless of the efficiency scores I saw earlier, I made 808 (38:2 w/l) and 764 (36:5 w/l) respectively in those separate hour runs.
Without selling won cards, if I just assume a 750 electrum an hour grind now, Instosis is quite far away. That partial rol/hope deck at $14k seems attractive since the variance on unupped LA is a bit too high for my bank account. My first hour run at LA netted me 2 upped cards and -208 electrum, so a gain of 2k for that hour. That is more than double the AI3 grinding. However, if I add in the last 28 games (27 skips/losses and 1 win with no card), I'm back down to ~$1k an hour.
Dunno, I could just grind out and casually have fun in AI3 until I go for the partial rol/hope or instosis, or go the frustrating but slightly more lucrative unupped LA method. Honestly, dunno, but after that last hour of 27 skip+losses and 1 win...meh