The pitfalls of layaway plans are well known (e.g. mostly used by lower income people who are financially gouged with this type of purchasing modality):
http://marginalrevolution.com/marginalrevolution/2013/10/stayaway-from-layaway.html
I too am a parent but I put my daughter (and wife) first. She goes to a private school, takes karate (will be a black belt next year when she turns 10). She takes art and guitar lessons too. She is an A student with a bright future. She belongs to a private beach club. This year she visited Nepal twice, Copenhagen, Stockholm and Canada. She friends with a young sheik (Mohammad bin Sultan bin Zayed) and has play dates at his palace.
Here is his father's bio
http://cmc.ae/english/about_us.html
Now tell me about your kids and the bright future you are preparing for them.
I did buy something for myself when I was young like you ... I invested in my education and eventually earned my MBA and PhD. My sacrifice has paid dividends for me and my family. I did not make the rules up for financial and parental responsibility; I am only reporting them to someone who knows what I am saying is true but is easily offended.
The simple fact is that when you get your priorities right, good things follow; the converse is also true.
GJS
p.s. While I did make a judgement about you (and you have confirmed its accuracy), I have not resorted in name calling.