I'm sorry, but your wrong again!
Any company that is not in danger of going bust is worth buying at the right price. H!LL Warren Buffet even bought Berkshire Hathaway.
SGP has growth, good quality earnings, an attractive brand (so far,) and a good balance sheet. What it hasn't had is management experienced in managing a large firm and/or scaling a small firm up to a large one. This was obvious when the price was still in the teens.
Now it is at £3 and change is a hopeless time to capitulate (I do admit I have been buying.)
What you should do is set yourself a stop loss of 10% or 15% when buying a stock and sell on a relatively small loss. Rather than waiting for the price to get down to 30% of your buy price and then admit you got it wrong then. That way you will always be able to buy at the point of maximum pain and despair. And when the stock offers best value.