Same here! I sew and often get the "can you just alter this for me...."
Um, no! People have no idea how time consuming some alterations can take and how awkward some can be, just unpicking some garments is a nightmare in itself. I don't mind the odd alteration for free for a loved one, but when people at work ask me and expect me to do it for nothing I just laugh in their face!
I definitely wouldn't make clothing for others, I couldn't live with the pressure! Also folk are very reluctant to pay you properly for your time, and the fabric. Cheap, fast fashion has really made people de-value the time, effort and skill involved in clothes making.