Barker, 28, insists he made the right choice and would do the same thing again.
He told The Sun: "It's funny how things work out. Obviously I made the move with a long-term view to getting in the Premier League.
"People have said I must be gutted but in the same situation, I'd make the same choice. I looked at the reality, everything was right. A bigger club, more money - and I don't care what some say, that's a big thing.
"I had an offer to improve my life, move back to my family and do the right thing for my two-year-old daughter.
"People go on about how much footballers earn but it's a short career and outside the top level you need to be careful and do right for your family. I was looking at one day playing in the Premier League and everything at Derby seemed right."
Barker even watched Blackpool's play-off final win over Cardiff and can just about admit to his mixed emotions.
He added: "I was delighted for them but there is bound to be that little thought of 'What if?'
"What Ian Holloway has done there is beyond comprehension."