1) Rm100 is it more or less can cover the expanses and maintenance fee?
2) What is some resident dont pay the fee if they thought Rm100 is alot (1000 house x RM100 = RM100k per mth?)
3) Can you sell the house if you dont pay the maintenance fee? Does the committee has right to stop owner from selling out the unit?  
4) Is the group / persatuan can collect fee on behalf of the resident?

starting to pay this mth and need to pay 2 mths advance and still they dont let us know the security company name.

Even with my korek-ing skill, this company is nowhere to be found

Good luck.

I can answer ur questions. I used to be in such committee before.

Bunch of residents will form the committee on volunteer basis. If u can, join it. It's not troublesome, yes take abit of ur time periodically but not really a full time thing.

For non paying owners, committee will make things difficult for them don't worry.
Can block any construction work or stuff until they clear the outstanding fees. They have to register as visitor to enter in.

No, cannot stop owner from accessing the house, just make it troublesome.

When u buy into gng, there is a binding guideline policy to follow. Every owner agreed to it.
Yes not fair for paying members but we follow law and order. Just because ppl steal but u work hard doesn't mean u should follow bad practices.

Paying maintenance per quarter upfront is commonly practised so that the sub committee cash collector no need to keep approaching owners to collect money monthly. The collector usually is a resident.

Likely when committee members start to quit, committee may opt to outsource it to management company to ease committee from spending too much of their time to run the gng.

Your money goes to maintaining the gng, other misc rubbish, grass cutting, security, other expenses like utitles or improvement. Yes technically gov will deploy contractors to cut grass or collect your housing rubbish but they won't do a fantastic job. Committee hire more contractors to help make gng more cleaner. Just think it as tuition for ur kids.

90% of all newly formed committee are usually new at managing committee. So understandable if certain things seem abit weird, slow or lacking. Hard to get ex committee members who moved to your new gng, and get them to join because it's a volunteer job. Not everyone likes it.

New committee group have to learn slowly how run the gng successfully.

As for money, don't be too worried. Committee are residents, owners. They are also worried about their own house.