We pay them, yet why?

Section 70 of the House rules states that those who can be deemed present are:

• Members who are attending committee meetings as authorized by the Committee on Rules, in accordance with Section 35 hereof, upon written notification to the Secretary General by the concerned committee secretary;
• Members who are attending meetings of the Commission on Appointments;
• Members who are attending meetings of the House of Representatives Electoral Tribunal;
• Members who are attending meetings of bicameral conference committees; and
• Members who are on official mission as approved by the Speaker.