I don't think you would ever get a single block solo mining, currently despite people dropping off the global hash rate is at least 100,000 MH/s. If you are running a single GPU you will make what 25-50 MH/s? Each block reward is only 9.5 coins. Now let's assume the average is 1 block every minute. Pretty sure if you do the math you'll quickly see it's a waste. Not to mention even if you hit a single block by chance, you will only make 9.5 coins, which is probably not worth much anyways, considering the swap is counting 1 STRAK as 4 SIGT (Currently 1.3 cents per a SIGT).