One question asked when buying a new card: why would you want to buy that one instead of another?
Let us just see. The main concern of SLI is either heavy workload or heaving gaming, which also implies heavy workload, which for those who play casually, won’t need something that fancy.
Another main concern is that of electricity bill. Multiple cards require more powerful PSU and 400 Watt won’t cut it. If using 1000 Watt could multiply your productivity and thus enable you to pay your bill, then go for it. If not, then why bother?
But of course it’s your money and you can anything about it. Why bother listening to what I’ve said?