Hello!
I am a web developer and UI designer, having worked with international firms with a wide range of websites.
If I understand your requirements properly; you require a website that:
1 - Takes user registrations.
2 - Has a payment portal setup (accepting PayPal and/or other online payment processors).
3 - Users can buy "lotto tickets".
4 - Lotto winners get that amount credited to their account balance.
6 - Users can request withdrawals.
As a bonus; I can also setup a simple forums board for your users to build a community.
If this is close to your requirements, I can assure you that I have the expertise required to build you something like this. I will use PHP with MySQL for the backend, and HTML5, CSS3 and jQuery for the front-end elements.
I focus on precision, quality, delivering on time, and always leaving my clients satisfied.
Looking forward to your response.
Best Regards,
Ali