A few reason actually :
for one -
I guess it depends on the needs of the customers. The price vs. quality balance definately seems to be tipped towards price here...
I would say that most of the people earning so little they will always take chances going for lower prices.
for two - there used to be guilds for different crafts, there isn't anymore so anyone can claim to be .............(put right word here).
for last point -
there nothing you you as a customer can really do about bad workmanship, no pay and kick his ass is only real option here and doesn't happened often obviously.
Do tell, what has capitalism (or any other system) got to do with doing a job thoroughly?
At your service ......
if you are say plummer and you are doing your job thoroughly you are being paid the same money as some of your colleges who can't be arsed to do job properly, they rush over the list of custumers in hurry becose they have allready prived clients and real many to be made.
So they have a money, sometimes they are being promoted if giving lip service to the socialism and the Party, they have a car and all the little thing making the life better.
And they call you sucker, wife call you looser and children are asking but mr X is plummer as well and he got ................!
Somebody had to have a great moral integrity to not become like others.
That what system have to do with crating such moral atmosphere in which such things as stated in the OP post become possible and common enough.
Is that answer your question jonni?
Whatever happened to personal pride and self-respect?
Has that left the Polish worker as well?
for Polish workers - anyway majority of them - personal pride and self-respect have nothing to do with doing onces job properly but with making success = money.